added job to log queue lengths

backend/src/jobs/index.ts

@@ -1,5 +1,11 @@
 import updateLeaderboards from "./update-leaderboards";
 import deleteOldLogs from "./delete-old-logs";
 import logCollectionSizes from "./log-collection-sizes";
+import logQueueSizes from "./log-queue-sizes";
 
-export default [updateLeaderboards, deleteOldLogs, logCollectionSizes];
+export default [
+  updateLeaderboards,
+  deleteOldLogs,
+  logCollectionSizes,
+  logQueueSizes,
+];

backend/src/jobs/log-queue-sizes.ts

@@ -0,0 +1,31 @@
+import { CronJob } from "cron";
+import Queues from "../queues/index";
+import { setQueueLength } from "../utils/prometheus";
+
+const CRON_SCHEDULE = "0 */5 * * * *";
+
+async function main(): Promise<void> {
+  Promise.all(
+    Queues.map(async (queue) => {
+      const counts = await queue.getJobCounts();
+
+      const active = counts.active;
+      const completed = counts.completed;
+      const failed = counts.failed;
+
+      const waiting = counts.waiting;
+      const paused = counts.paused;
+      const delayed = counts.delayed;
+      const waitingChildren = counts["waiting-children"];
+
+      const waitingTotal = waiting + paused + delayed + waitingChildren;
+
+      setQueueLength(queue.queueName, "completed", completed);
+      setQueueLength(queue.queueName, "active", active);
+      setQueueLength(queue.queueName, "failed", failed);
+      setQueueLength(queue.queueName, "waiting", waitingTotal);
+    })
+  );
+}
+
+export default new CronJob(CRON_SCHEDULE, main);